Stereopticon slide and projection apparatus therefor



Feb. 22, 1938. FQCQBRADY 2,108,844

sTEREoPTIcon SLIDE AND PROJECTION APPARATUS THEREFOR File'd Nov. 4, 17935,:

.ze 14 fr? il spinner mounting.

Patented Feb. 22, 1938 i TAT@ STEREOPTECN SMDE AND PRGJIEGTHN APPARATUS THEREFOR Frank C. Brady, Ehlcago, lili.

Application November 4, 1935, Serial No. 48,999

In Canada February 6, 1935 4 Claims.

The invention relates to improvements in stereopticon slides and projector apparatus, in. cluding a chance device; and more especially to an air cooled projector apparatus and a slide embodying an animated chance device, by which, when light rays are projected through said slide, the operation of the chance'device is projected at a point remote from the projector, such as on a screen.

An object of the invention is to provide an im-` proved portable air cooled light ray projector machine particularly adapted for projecting light rays through a stereopticon slide embodying a chance device.

Another object is to provide novel means to prevent overheating or cracking the slide.

Another object is tol provide -a novel spinner, having indicating characters thereon, for co- --operation with a fixed indicator of a stereopticon slide.

Another object is to provide astereopticon slide of the character referred to' .with an improved Another object is to provide novel means in a alight ray projector machine to adjust the slide relative thereto. Y

The foregoing and such other `objects of the invention as will appear hereinafter as the description proceeds, will be more readilyunderstood from a perusal of the following specification, reference being had drawing, in which:

Fig. 1 is a vertical sectional view, partly in elevation, ofthe improved light ray projector machine, showing a slide in operative position.

Fig. 2 is a sectional view taken-on line 2-2 of Fig. 1, showing the receptacle, the slide and a slide holder partly in elevation.

Fig. 3 is a fragmentarysectional view of the slide taken `on line 3--3V of Fig. 2, showing one form of pivotal mounting for the spinner.

Fig. 4 is a fragmentary view similar to Fig. 2, showing a modified form of stereopticon slide.

Fig. 5 is a view similar to Fig. 3 showing a modified form of mounting for the spinner; and

Fig. 6 is a view similar to Fig. 5 showing another form of spinner mounting.

The portable light ray projector machine shown in the drawing is designed especially for use in commotion with the improved stereopticon slide embodying a chance device of the type shown in this application and in the Patent No. 1,584,531, to H. L; Hagan dated May 11, 1926 which is assigned to applicant. Although slides .to the accompanying 'of ordinary construction also may be used in this v as in prior art machines. the present machine is designedV especially for use with the slide of the type of the present invention. The slide of the present invention remains `in themachine a considerable length of time, therefore, if a machine' (ci. ss-zm' lacking the improvements of the present invention is used, the heat generated would tend to lcrack the slide. The objections toprior structures have been overcome, by providing, as will .be more fully explained hereinafter, means to permit air to circulate freely on both sides of the slide, and a receptacle for the slide spaced further from the light source than in projectors designed for ordinary slides, which remain adjacent thel .heat area but an instant.

lAs shown, the projector proper is mounted as at I0 on a base II for pivotal adjustment through a vertical plane. A substantially rectangular vertically disposed housing I2, open at both ends, is provided with a cover I3, having numerous openings I4 thereinv to allow free circulation of air therethrough to dissipate the heat. A ange I5, preferably'extending inwardly, at the bottom, fromone wall of the housing I2, carries' a' light socket I6 adapted to receive a lamp I1.

A tubular extension I8, having. a lens I9 mounted at its outer end,rprojects outwardly a short distance from one Wall of the housing I2 and has a receptacle 2l connected to its outer end. As clearlyillustrated in Figs. 1 and 2, the reoep` tacle 2I preferably is formed substantially rec.- tan'gular to receive a holder 22, which carries the stereopticon slide assembly 23, and has a plurality of adjusting screws 24 to insure proper alignment of the stereopticon slide, with the extension I8. A telescopic tubular lens holder 25-26 containing lens 30, projects outwardly from the face of the receptacle 2i in axial alignment with the extension I8. It is obvious that the position of the receptacle 2| and the structure of the ventilated.

housing I2 are such that the slide is not subjected to the direct heat of the lamp Il. To further guard against damage to the slide, the inside faces of the walls of .the receptacle 2| are recessed. as at 2l, to permit free circulation of air on both faces of the slide 24. A shield 28, arranged around the lamp I'I, preferably is suspended within the lamp housing I2, by a bracket l29.' The shield has an opening 3l on one side to permit the light rays to pass into the tubular extension I8. A light ray shield 32 is carried vin the cover I3 spaced from the top thereof so as not to obstruct openings I 4.

.'I'he stereopticon slide best illustrated in Fig. 2

is of the type embodying an animated chance de-V vice, preferably consisting of a series of lindicating characters 33 Iarranged equi-distant from a common center. and a. spinner 34 arranged therein to rotate about said centerto co-operate with said characters while the light rays are being projected through said slide upon a screen, whereby the operation of the chance device `can be observed. A-n examgple oi' use is for instance, 'in a moving picture theater, where an award is made to the holder of'a number or other character at which the spinner finally rests is checked' upon the card having that character, and when, after successive spinnings of the spinner, all characters on a single card have been checked, the game is terminated.

As shown inoFig. 3, the spinner 34 preferably has a boss 35 on each side thereof and a trunnion 36 extending outwardly from each boss, one adapted to be seated in a bearing 31 i'ormed in one face of one glass plate 38 and the other in a bearing block-31a set in the opposite glass plate 38. Eachplate 38 may be provided with bearing 31 or bearing block 31a, as alternate constructions. The plates 38 are held in spaced relation by a suitable spacer sheet 39 (Fig. 2) which preferably iills all the space between the plates except that required to allow spinning of the spinner 34. A binding tape 40 holds the plates together. The spinner preferably is spun by a blast of iiuid, preferably air, generated by squeezing a bulb 4l, provided on one end of a connecting rubber tubing 42. The other end of said tubing communicates with a passage 43 provided between the glass plates 38. To 'insure proper distribution of the air forced between the plates, the passage 43 preferably branches off into passages 44 and 45 which open, substantially at right angles to each other, into the space around the spinner. It is obvious that while air is being forced through passages 44-45 the spinner is rapidly rotated regardless of the position in which it may have stopped after its preceding operation. `The spent air may escape through a port 4S (Fig. 4) or otherwise leak out.

Another form of chance device, shown in Fig. 4, may consist of a suitable translucent spoked wheel 41, having indicating characters 48, preferably cut out equi-distant from the center of rotation to allow passage of light rays therethrough. The wheel 41 is adapted to be spun in the same manner as the spinner 34 previously described and to this end, the wheel preferably has a plurality of curved radial vanes 49 extending inwardly a short distance from its circumferential edge to receive the impact of the air bla'st ejected through passages 44-45. A visible indicator 50 provided in this type of stereopticon slide, indicates the character to be considered by the observer. The wheel 41 may be pivotally mounted in the manner shown in Fig. 3 or other suitable mountings may be employed, such as are shown, by way of example, in Figs. and 6, for either the spinner or the Wheel. A disk may be used instead of the wheel 41 and either may be transparent with opaque indicating characters and an opaque indicator may be used.

The loose pivot mounting illustrated in Fig. 5

includes a trunnion 5I, having a flange 52 adjacent oneend, adapted to be held non-rotatably between the spaced plates 38. The spinner 34 or wheel 41 is rotatably mounted on the trunnion 5i and a spacing washer 53 prevents wobbling of the spinner or wheel.

The mounting shown in Fig. 6, includes a bearing plate 54 having a trunnion 5 5 on opposite faces, one adapted to iit into a bearing in one of the glass plates 38 and the other to engage in an axial recess 53 provided in the adjacent face of the spinner 34. An axial projection 51 formed on the opposite face of said spinner is adapte/.i to be seated in a bearing 31 in the other glass plate 38 and a spacing washer 53 is iltted over said projection to insure stability. A

Although exemplary forms of streopticon slides and pivotal mountings for the rotor have been shown and described, it is to be understood that the improved spaced plate assembly embodying a chance device may be used apart from a light ray projector and that each assembly may embody variations in detail structure without departing from the spirit of the invention or the scope of the appended claims.

I claim:

1. A slide adapted to be held in a receptacle of a light-ray projector, including spaced transparent plates having an air inlet and outlet therebetween, a iixed indicator associated with said plates, an opaque spinner pivotally mounted between said plates, vane's on said spinner, and a series of transparent indicating characters on said spinner all substantially equi-distant from its center of rotation and arranged to pass ad- -jacent said tlxed indicator' as air is forced through the inlet against said vanes to rotate the spinner, whereby the operation of the spinner can be visibly projected'upon a screen.

2. A slide adapted' to be held in a receptacle of a light ray projector, including spaced transparent plates, aiixed indicator mounted between said plates, a spinner rotatably mounted between said plates, a plurality of circumferentially spaced vanes mounted on said spinner, and a series of indicating characters on said spinner all substantially equi-distant from its center of rotation and arranged to pass adjacent said fixed indicator as the spinner is rotated, whereby the operation of the spinner can be projected upon a screen.

3. A slide, including a pair of spaced parallel transparent plates, means holding said platesin spaced relation for movement bodily into or from the receptacle of a light ray projector, a fixed indicator mounted between said plates, a disk spinner pivotally mounted between said plates, a series of transparent indicating characters on' said spinner arranged to pass adjacent said xed indicator as the spinner is rotated, radial vanes on the spinner spaced between said characters, and means to discharge an air blast against said vanes for rotating the spinner, whereby the operation of the spinner may be projected upon a screen.

4. A slide, including spaced transparent plates, aligned bearings in said transparent plates, a spinner having a bearing mounted between said plates, a trunnion on said spinner rotatably mounted in the bearing in one of said plates, a bearing plate having a trunnion mounted in the bearing in the other plate, a second trunnion on said bearing plate to engage in the bearing in said spinner, a plurality of spaced air passages in said slide for discharging air in different directions in the plane of rotation of said spinner, and means for creating a blast of air through said passages and against the spinner to impart movement thereto.

FRANK C. BRADY. 

